Pole controlled vibrating tamping device



April 18, 1967 G. scHULlN ETAL 3,314,341

POLE CONTROLLED VIBRATING TAMPIVNG DEVICE A Filed Oct. 14, 1964 5 Sheets-Shee-t 1 April 18, 1967 G. scHuLlN ETAL 3,314,341

POLE CONTROLLED VIBRATING TAMPING DEVICE Filed Oct. 14. 1964 `5 Sheets-Sheet 2 POLE coNTRoLLED VIBRATING TAMPING DEVICE Filed oct. 14. 1964 April 18, 1967 G. scHuLlN ETAL 5 Sheets-Sheet .'5

1@ "UWM April 18, 1967 GSCHULIN ETAL 3,314,341

POLE CONTROLLED VIBRATING TAMPING DEVICE Filed oct. 14. 1964 5 sheets-sheet 4 April 18, 1967 G. scHuLiN ETAL POLE'CONTROLLED VIBRATING TAMPING DEVICE Filed oci. 14. 1964 5 Sheets-Sheet v5 center of gravity location of center of gravity on pole Fig. 7

Main parts (masses) of vibration soil tamper appiied toad on the surface Inventors, Ga//////` Sr//lr ///`/7 S/e//h/Qy Bf bottom pan United States Patent O 3,314,341 POLE CONTROLLED VIBRATING TAMPING DEVICE Gotthilf Schulin, Fellbach, and Heinz Stellwag, Deizisau,

Germany, assignors t Delmag-Maschinenfabrik Reinhold Dornfeld, Esslingen (Neckar), Germany Filed Oct. 14, 1964, Ser. No. 403,947 Claims priority, applicatiglgrmany, Oct. 19, 1963,

The present invention relates to a tamping device or soil compactor, and, more specifically, concerns a pole controlled vibrating tamping device with a pole linked to said device through -rubber elastic means.

With heretofore known vibrating tamping devices as for instance vibrating plates and vibrating rollers, guided by hand, the devices are guided by long guiding members such as guiding poles, guiding handles or the like henceforth called guiding poles `in this specification, by means of which the operator guides the device over the surface to be tamped or compacted. This guiding pole is with some devices of the type involved connected either to a bottom pan subjected to vibrations and pertaining to a plate tamping device or is connected to the machine part designated as applied load which is resilien-tly supported by the bottom trou-gh or pan or by the vibrating rollers. With some designs of devices of the type involved, the pole is connected to the device in the above mentioned manner, i.e. the pole is connected to the vibrating tamping device through the intervention of rubber elastic elements. These rubber elastic elements serve the purpose of keeping away from the pole the vibrations caused by the movements and accelerations of the vibra-tion generator or the engine driving the same as for instance an internal combustion engine.

In spite of the employement of these elastic intermediate members, the vibrations on the pole end of heretofore known soil tamping devices with vibrating plates or rollers are still considerably strong and, therefore, the hands of the operator holding the end of the pole are subjected to considerable uncomfortable and sometimes almost intolerable vibrations.

It is, therefore, an object of the present invention to provide a soil tamping or compacting device which will overcome the above mentioned drawbacks.

It is another object of this invention to provide a vibrating tamping device of the general type set forth above, in which the vibrations necessary for tamping the soil will, for all practical purposes, not or -hardly be felt in the handle portion grasped by the operator for handling and guiding the tamping device.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:

FIG. 1 is a perspective view of a vibrating soil tamping device according to the present invention.

FIG. 2 illustrates on a somewhat larger scale than FIG. 1 a top view of that portion of the device to which the pole is linked.

FIG. 3 is a side view of the arrangement shown in FIG. 2.

FIG. 4 diagrammatically illustrates in section the connection of the pole to the -tamping device and shows various positions of the pole into which it may be moved along a vertical plane.

FIG. 5 diagrammatically illustrates various positions of the pole into which the latter may be moved along a horizontal plane.

FIG. 6 is an isometric view of the pole and indicates the location of the center of gravity on the pole.

ICC

FIG. 7 is a diagrammatic showing of the main parts (masses) of the vibrating soil tamping device.

Referring now to the drawing in detail, the device illustrated therein is a soil tamper or compactor which comprises a bottom trough 11 adapted to be subjected to vibrations, a vibration generator and an in-ternal combustion engine 12 for driving the vibration generator, said engine 1'2 being mounted on a hood-like cover member 13. As seen in FIGURE 7, the member 13 is supported by springs 30 on the trough 1-1, which is vibrated by the rotating vibratory weight 31 supported on trough 11 at 11a and driven by belt 32 from the engine 12. Inasmuch as the details of the engine and the power transmitting means from the engine to the vibrating tamping means and the vibration tamping means themselves do not form part of the present invention and are known per se, no further description of these parts appears to be necessary.

lFor purposes of connecting the guiding pole 14 to t-he cover 13, cover 13 has fixed thereto a connecting portion 15 for instance by screws 13a (FIG. 3). Connecting portion 15 is provided with two arms or elements 15a and 15b which within the range of their ends are provided with bores 15e, 15d respectively for the passage of screw bolts thereto. Tiltably connected to said elements 15a and 15b is a fork-shaped connecting member 17 of pole 14. However, it should be noted that this tiltable connection is not by way of a slidable journalling but is effected in a manner which will be described further below. Respectively screwed to the plane outside of elements 15a and 15b are cylindrical rubber members or resilient elements 18 and 19 having their end faces provided with plates 20 vulcanized thereonto. The central areas of said plates are provided with threaded bores which continue in the form of threaded members 21 serving as nuts and welded to the inner side of said plates 20. By means of screws 22 which on the inside have haxagonal heads and the shanks of which extend through washers and bores 15C and 15d and which threadedly engage the bores of plates 20 and the threaded -members 21, the rubber members or rubber shock absorbers are lfirmly clamped against the outer surfaces of the supporting arms 15a and 15b.

The outside of rubber member elements `18 and 19 and the outer plates 20 thereof are embraced by arms or elements 17a and 17b of the fork-shaped part 117. The said arms or elements 17a and 17b have the inner sides thereof provided with corresponding engaging surfaces for engagement with the outer sides of the rubber members 18 .and 19. Also arms 17a and `17b are provided with bores 17c and 17d respectively for the passage of Shanks of screws 23 corresponding to Ithe above mentioned screws 22. Also in this instance, the inner sides of plates 22 are each equipped with a threaded member 21 for threadedly receiving the threaded Shanks of screws 23. These thread members are vulcanized to the rubber members 18, 19 when plates 20 are vulcanized thereto.

For additionally safeguarding plates 20 against accidental turning relative to the engaging surfaces of supporting arms 15a and 15b, and arms 17a and 17b of the fork-shaped member 17, there are provided safety screws 24 which extend through the respective arms and into corresponding bores of plates 20. The link connection of the fork-shaped part 17 of pole 14 with the vibrating soil tamper or compactor, generally designated V, is effected by elastic coupling means which permit relative movements between the pole relative to the vibrating tamper and also permit even the very great tilting movements of pole 14 about the horizontal axis defined by the bores 15C, 15d and 17C, 17d without journals or sleeve bearings. These relative movements and tilting movements are made possible merely by an elastic deformation of said rubber members 18, 19. Fork-shaped member 17 is, between the two arms 15m and 15b, provided with an extension 17e (see FIG. 2) and has opposite said extension a socket 17] for receiving the lower end of pole 14. The connection of pole 14 to socket 17j may be effected in any convenient manner for instance by a screw connection.

Referring now to FIGS. 4 and 5, these figures illustrate different possible positions of pole 14 the outer end of which is, provided with handle bars 14b as shown in FIG. 1. The said handle bars are equipped with handle sleeves 26 and are slightly arched away from pole 14.

The handle arms and pole have in customary manner adjusting cables, such as Bowden wires and the like connected thereto for controlling the internal combustion engine. However, in order not unnecessarily to clog up the drawing, these actuating cables or the like have been omitted.

As will be evident from the drawing, the guiding fork 17 represents a considerable mass relative to the pole 14 which advantageously is in the form of a pipe, and with d regard to the handle bars 14!) which likewise may be tubular. The mass center of the pole including the guiding fork is located within the range of that quarter of the pole length which is located within the range of the link connection. Solely by elastic deformation of the rubber members 18 and 19, it is possible to move the pole about a horizontal geometric axis I into the positions shown in full and in dot-dash lines in FIGS. 4 and 5. Aswill be evident therefrom, a considerable tilting angle a can be obtained. The lowermost illustrated tilting position is limited by engagement of an abutment member 25 mounted on support 15 by a nose 17e of fork-shaped member 17 and engagement of socket 17j by the bottom 15k of a cutout 15jc in support 15. Upon further tilting of pole 14, a torque about a horizontal transverse axis is exerted about the vibrating tamper so that the rear portion of the bottom pan 11 will be under a' greater load than the front portion. When laterally moving pole 14 about the geometric axis II, pole 14 will, while deforming the rubber members 18 and 19, convey its angular movement to the vibrating soil tamper. After a certain horizontal angle has been exceeded, the further transfer of the angular moment is by means of abutments on opposite sides of the axis II positively conveyed to the device. To this end, the section 15e of connecting portion 15 is provided with a slot 15f through which extends pole 14 while the side walls 15g and 15h of slot 15j spaced from the pole serve as abutments. Furthermore, the abutment member 25 is provided with lateral abutment strips 25a and 25b so that connecting portion 15 is provided with abutments for producing a positive transfer of the angular movement of pole 14 through fork 17 and its elastic coupling connection to the tamping device. Abutments 25a and 15h are engaged by nose 17e and socket 17 f for bringing about a right-hand angular movement of the vibrating soil tamper and limit the elastic angular movement of pole 14 while serving for a positive transfer of the turning moment. A left-hand angular movement of the tamper is effected by engagement of the abutments 2517 and 151g with nose 17e and sockets 171, respectively. By means of the above mentioned rubber elastic coupling connection of pole 14 to the vibrating soil tamper, all vibrations will be kept away from the operating end of pole 14 or are at least reduced to a practically negligible magnitude. These vibrations include longitudinal vibrations along the axis of the pole, and also longitudinal vibrations which occur at the link connection of the pole with the tamping means proper and vibrations perpendicular to the soil to be treated.

With regard to the pole, in this specic example, the weight of the pole is 25 kilograms. The center of'gravity of thepole is located in that last fourth of the length of the pole which is adjacent the tamping arrangement proper. The length of the pole in this specific example is 130 centimeters, and the distance of the center of gravity of the pole from its connection with the rubber elements is 22 centimeters. The distance of the center of gravity thus amounts to approximately 17% of the total length of the pole.

It is, of course, to be understood that the present invention is, by no means, limited to the particular arrangement and example set forth above but also comprises any modications within the scope of the appended claims.

What we claim is:

1. A soil tamping and compacting apparatus having a bottom member adapted to vibrate', a cover member provided With a connecting portion, and means for vibrating said bottom member, said apparatus including pole means for manually handling said apparatus and having a connecting member on the front end adjacent said cover means and handle means on the rear end, at least two elastomeric coupling elements between said connecting member and said connecting portion and connecting said cover means to said pole means so that said pole means is connected to said cover means by a plurality of resilient coupling elements for movement about a transverse axis and universal angular movement about the point of intersection of said transverse axis and the axis of said pole means, said connecting member having an extension on the front end forward of said transverse axis, said connecting portion being provided with an abutment means spaced from and underlying said pole means and a second abutment means on the opposite side of said transverse axis spaced from and overlying said extension, said abutment means being adapted to engage said pole means and extension, respectively, simultaneously upon depression ofsaid pole meansto provide a positive engagement between said pole means and said cover means and tilt said cover ineans.

2. An apparatus according to claim 1, in which the lower end of said pole means includes a fork-shaped connecting member, and in which the rubber elastic coupling elements consist of soft rubber blocks having their end faces non-rotatably connected to said connecting member on one hand and to said connecting portion on the other hand, the longitudinal axes of said rubber elastic means being in substantial alignment with each other and substantially coinciding with the tilting axis of said pole means. 1

3. An apparatus according to claimV 1, in which said connecting member forms the major portion of the mass of said pole mean so that the center of mass of said pole means is located within one-quarter of the length of said pole means from said axis. t

4. A soil tamping and compacting apparatus having a bottom plate adapted to vibrate, a cover member provided with a connecting portion and supported on said bottom plate, means to vibrate said bottom'plate and motor means to operate said means to vibrate said bottom plate, said apparatus including pole means arranged for manually handling said apparatus and including a handle portion on the rear end and a connecting member on the frontend adjacent said cover means, said connecting member and connecting portion comprising spaced, opposed, transversely aligned elements, two resilient elements of elastomeric materialV spaced along a transverse axis, each vhaving its opposite transverse ends secured to said opposed elements on said connecting member and connecting portion, respectively, to connect resiliently said cover means and pole means, the axis of said pole means intersecting said transverse axis intermediate said resilient elements so that said pole means has uni- Y versal angular resilient movement about said point of intersection, said connecting member having an extension on the forward end in front of said point of intersection, said connecting portion having rear abutment means rearwardly of said transverse axis and spaced below and to each side of said pole means to limit downward and lateral movement of said pole means and front abutment means forward of said transverse axis and spaced up- 3 ,3 1 4,3 41 5 6 wardly and laterally of said forward extension to limit 2,737,094 3/ 1956 Jackson 94-48 upward and lateral movement of said extension, said rear 2,771,012 11/ 1956 Jackson 94--48 and front abutment means providing a positive connection 2,819,479 1/ 1958 Sutton 15-49 between said pole means and cover means when said pole 2,873,656 2/ 1959 Andersson 94-50 means is moved downwardly or laterally about said point 2,967,315 1/ 1961 Helbig 15-49 eiriltsersection to engage said rear and front abutment FOREIGN PATENTS References Cited by the Examiner 637,107 2/ 195 3 Great Britain. UNITED STATES PATENTS 906,951 9/ 1962 Great Britain.

2,630,784 3/ 1953 Wallerstein 306-20 10 JACOB L. NACKENOFF, Primary Examiner,

2,683,884 7/1954 Kohl 15-49 

1. A SOIL TAMPING AND COMPACTING APPARATUS HAVING A BOTTOM MEMBER ADAPTED TO VIBRATE; A COVER MEMBER PROVIDED WITH A CONNECTING PORTION, AND MEANS FOR VIBRATING SAID BOTTOM MEMBER, SAID APPARATUS INCLUDING POLE MEANS FOR MANUALLY HANDLING SAID APPARATUS AND HAVING A CONNECTING MEMBER ON THE FRONT END ADJACENT SAID COVER MEANS AND HANDLE MEANS ON THE REAR END, AT LEAST TWO ELASTOMERIC COUPLING ELEMENTS BETWEEN SAID CONNECTING MEMBER AND SAID CONNECTING PORTION AND CONNECTING SAID COVER MEANS TO SAID POLE MEANS SO THAT SAID POLE MEANS IS CONNECTED TO SAID COVER MEANS BY A PLURALITY OF RESILIENT COUPLING ELEMENTS FOR MOVEMENT ABOUT A TRANSVERSE AXIS AND UNIVERSAL ANGULAR MOVEMENT ABOUT THE POINT OF INTERSECTION OF SAID TRANSVERSE AXIS AND THE AXIS OF SAID POLE MEANS, SAID CONNECTING MEMBER HAVING AN EXTENSION ON THE FRONT END FORWARD OF SAID TRANSVERSE AXIS, SAID CONNECTING PORTION BEING PROVIDED WITH AN ABUTMENT MEANS SPACED FROM AND UNDERLYING SAID POLE MEANS AND A SECOND ABUTMENT MEANS ON THE OPPOSITE SIDE OF SAID TRANSVERSE AXIS SPACED FROM AND OVERLYING SAID EXTENSION, SAID ABUTMENT MEANS BEING ADAPTED TO ENGAGE SAID POLE MEANS AND EXTENSION, RESPECTIVELY, SIMULTANEOUSLY UPON DEPRESSION OF SAID POLE MEANS TO PROVIDE A POSITIVE ENGAGEMENT BETWEEN SAID POLE MEANS AND SAID COVER MEANS AND TILT SAID COVER MEANS. 